diff --git a/adb/adb.h b/adb/adb.h
index 0fb2008..8b3359e 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -227,8 +227,8 @@
 void connect_to_remote(asocket *s, const char *destination);
 void connect_to_smartsocket(asocket *s);
 
-void fatal(const char *fmt, ...);
-void fatal_errno(const char *fmt, ...);
+void fatal(const char *fmt, ...) __attribute__((noreturn));
+void fatal_errno(const char *fmt, ...) __attribute__((noreturn));
 
 void handle_packet(apacket *p, atransport *t);